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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '674438ae4424ce210f465b1c88371e67ec571b7af92b97ef82edf81355fe898f' 
  AND token = 's4liuJBRPWQnWKLlCzmbzWTEQ2LQy2RECqc5tQ9c7V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}